Revision Date Revision Level Revised By Revision Description

This device is intended to be used to mill keyways into steel shafts of known densities. The device also allows for easy installation of components such as sprockets, bearings, and keys after machining is completed. It is to be operated indoors, kept away from outdoor elements such as rain, heat, and snow. This is done to ensure optimum operation of all working components. Electrical components must be operating at 120V AC.

Requirements Specification:

No. Characteristic Relation Value Units Verification Comments

Method Real Need Prevent relativeRef. > 350 psi Analysis Ref. rotation Minimize processRef. < 2.5 Hours Analysis Ref. time Functional Requirements Depends on chosen type of key and keyway. Parallel-sunk keys are most commonly used since they prevent axial movement of key along shaft. Sprocket and Prevent relative bearings are held using a press fit 1. > 350 psi Analysis rotation and set screws are used to secure components in place Typical keyway must be able to withstand an avg. shear stress of 350 psi

Based on the weight of a typical

assembly consisting of a shaft, 2. Support shaft > 1800 Lbs. Analysis four sprockets, four bearings. Safety Factor of 2 is accounted for in the estimation Non-Functional Requirements Machining components do not Facilitate component hinder the assembly of rotating assembly * elements and allow for a wide = 2 Feet Analysis range of motion for the assembler1. *(Can also be defined as distance to user This value was chosen to be as from shaft) armlength, 360 degrees around the shaft being machined Based on average manual2. Calibration time < 15 Mins Analysis calibration time on a CNC machine table System Response Depends on the power delivered to3. < 1 second Examination Time electric drive motor Depends on electrical components, and wear generated4. Object Life > 20 years Examination with daily operation. Components more likely to fail are ones in direct contact with lumber Component(s) should be easily Downtime due to replaceable with spare parts,5. < 2 Hours Examination system failure without the need to spend added time on redesign Sensible modularity when Installation and setup6. < 6 Hours Examination designing will dictate easy device time assembly All steel, welded components, and some plastics will be sandblasted and painted for a7. Aesthetics consistent finish RAI Using wear resistant plastic (Relative (UHMW) on top of steel8. Abrasion resistance > 5 Analysis Abrasion components will improve wear Index) resistance qualities.

Constraints Safety must not only be exercised by equipment designers, but also by operators. Guarding1. Safety must be installed in place as instructed and all warning labels must strictly be followed. User’s manual must be referred to for proper device operation. As the average time to machine is described to be 25-30 mins, most Minimize process of the time is lost to calibrating2. < 2.5 Hours Analysis time the shaft. This should ideally be only be done once, in the entire process Maximize working Defined area around shaft being3. < 40 Sq. ft. Examination area machined (12’ x 3’)

Based on benchmarks and patents

4. Cost < 25,000 CAD Analysis studied

Maximum shaft Determined by project

5. < 12 Feet Analysis length requirements

Maximum shaft Determined by project

6. < 2 15/16 Inches Analysis diameter requirements

The device should easily support add-ons such as laser guides for locating keyways, dust7. Customizability collection system for metal chips produced during milling, and overhead camera(s) for improved overhead sight